Teratoma

Disease Description (Causes and Symptoms)

• Definition and pathophysiology: A teratoma is a tumor originating from pluripotent (or multidifferentiating) cells derived from the embryonic period. It is characterized by a mixture of tissues derived from the ectoderm, mesoderm, and endoderm. It mainly occurs along the body's midline (intracranial, mediastinal, retroperitoneal, sacrococcygeal, ovarian, testicular, and other sites). Most are mature (benign) teratomas, but cases with histologically immature features or malignant components may exhibit cancerous (malignant) behavior.
• Causes: Although the exact disease mechanism is unknown, the persistence of embryonic germ cells or abnormal differentiation is known to be involved.
• Main symptoms (features according to the site of occurrence)
  • Intracranial: Increased intracranial pressure causing headache, nausea and vomiting, altered consciousness, seizures, cranial nerve palsy, etc.
  • Mediastinal (chest): Often asymptomatic (incidentally found on chest radiography). If the mass becomes large, symptoms may include shortness of breath, chest pain, and swelling of the face and neck.
  • Retroperitoneal/abdominal: Abdominal pain and a palpable abdominal mass
  • Sacrococcygeal: Initially asymptomatic → if large, difficulty urinating or defecating, constipation, pain, and discomfort walking or standing
  • Genital organs (ovaries and testes): In the ovary, pain, abdominal distension, or incidental detection; in the testis, a mass or discomfort

Treatment Methods

• Principle: Treatment is determined according to the pathological findings (mature vs. immature/malignant), site, and extent. Complete surgical resection, when possible, is the first-line treatment.
• Surgery: Complete resection of a mature teratoma serves both therapeutic and diagnostic purposes. For sacrococcygeal teratomas, removal of the coccyx is often recommended to reduce the risk of microscopic recurrence. Mediastinal and intracranial teratomas require a specialized approach based on their anatomical location.
• Chemotherapy: When an immature teratoma or malignant components (e.g., embryonal carcinoma or nonseminomatous germ cell cancer) are present, standard chemotherapy (generally cisplatin-based regimens used for germ cell tumors) may be used after surgery or to reduce the lesion before surgery (the treatment plan is determined by a specialist according to the pathology and type).
• Radiation therapy: May be considered for some malignant or specific localized lesions, but it is not standard treatment (particularly in children and for lesions involving the reproductive organs, it should be used cautiously).
• Follow-up: Monitor for recurrence through regular blood tests using postoperative pathology results and tumor markers (AFP, β-hCG, etc.), along with imaging (ultrasound/CT/MRI).
• Life management and precautions: The possibility of functional impairment depending on the location (including nerve function, defecation, and urination) should be considered. For lesions involving the reproductive organs, counseling on fertility preservation and reproductive function is necessary. In children, effects on growth and development should also be monitored.

Checklist Before an Outpatient Visit (Including Preparations and Sample Questions)

• Items to bring (for a doctor's visit)
  • A list of currently taken medications (including prescription drugs, over-the-counter medications, and herbal medicines)
  • A summary of medical history (surgeries, anesthesia/allergies, and chronic diseases)
  • Previous test results (imaging (C/T, MRI, and ultrasound) reports and CDs, blood test results, pathology results, etc.)
  • A record of symptom changes (when they began, how they have progressed, and factors that worsen or improve them)
  • For women, recent menstruation and pregnancy status, and childbirth history (related to fertility preservation)
• Items to check before the outpatient visit
  • Location and nature of pain (whether constant or intermittent)
  • Changes in urination or bowel movements (frequency, feeling of residual urine, constipation, etc.)
  • Systemic symptoms such as fever, weight loss, and shortness of breath
• Sample questions (things to ask directly in the consultation room)
  • "Can this lesion be completely removed by surgery?"
  • "What complications are expected from the surgery, and how long will the recovery take?"
  • "At what intervals should follow-up tests (tumor markers and imaging) be performed?"

General Sample Questions to Ask the Doctor

• What are the common and serious side effects of this medication (or chemotherapy)?
• What is the prognosis of my teratoma based on the pathology results (mature/immature/malignant)?
• How likely is recurrence after surgery, and what treatment options are available if it recurs?
• How might the treatment affect fertility? What measures are needed to preserve it?
• What activities or lifestyle habits should I avoid in daily life?

Examples of Condition-Specific Questions

• (For those expected to receive treatment for a sacrococcygeal teratoma) "Does the coccyx also need to be removed during surgery? If so, what pain or changes in walking should be expected?"
• (For those with ovarian or genital teratomas) "Can the tumor be removed while preserving the ovary? Will it be possible to plan a pregnancy in the future?"

Additional References

• Imaging (CT/MRI/ultrasound) and tumor markers (AFP, β-hCG, etc.) are important for diagnosis, and the final diagnosis is confirmed by pathological examination (resection or biopsy).
• The prognosis varies greatly depending on the histological nature of the teratoma (mature, immature, or malignant) and whether complete resection is possible.